When multi-monitor is cycled the X,Y position of the Screen Target will
likely change but the resolution will not. We need to trigger a modeset
when this occurs in order to recreate the Screen Target with the correct
X,Y position.
Fixes a bug where multiple displays are shown in a single scrollable
host window rather than in 2+ windows on separate host displays.
Fixes: 426826933109 ("drm/vmwgfx: Filter modes which exceed graphics memory")
Signed-off-by: Ian Forbes <ian.forbes@xxxxxxxxxxxx>
---
drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c | 29 +++++++++++++++++++++++++++-
1 file changed, 28 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c b/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c
index a04e0736318da..9becd71bc93bc 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c
@@ -877,6 +877,32 @@ vmw_stdu_connector_mode_valid(struct drm_connector *connector,
return MODE_OK;
}
+/*
+ * Trigger a modeset if the X,Y position of the Screen Target changes.
+ * This is needed when multi-mon is cycled. The original Screen Target will have
+ * the same mode but its relative X,Y position in the topology will change.
+ */
+static int vmw_stdu_connector_atomic_check(struct drm_connector *conn,
+ struct drm_atomic_state *state)
+{
+ struct drm_connector_state *conn_state;
+ struct vmw_screen_target_display_unit *du;
+ struct drm_crtc_state *new_crtc_state;
+
+ conn_state = drm_atomic_get_connector_state(state, conn);
+ du = vmw_connector_to_stdu(conn);
+
+ if (!conn_state->crtc)
+ return 0;
+
+ new_crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
+ if (du->base.gui_x != du->base.set_gui_x ||
+ du->base.gui_y != du->base.set_gui_y)
+ new_crtc_state->mode_changed = true;
+
+ return 0;
+}
+
static const struct drm_connector_funcs vmw_stdu_connector_funcs = {
.dpms = vmw_du_connector_dpms,
.detect = vmw_du_connector_detect,
@@ -891,7 +917,8 @@ static const struct drm_connector_funcs vmw_stdu_connector_funcs = {
static const struct
drm_connector_helper_funcs vmw_stdu_connector_helper_funcs = {
.get_modes = vmw_connector_get_modes,
- .mode_valid = vmw_stdu_connector_mode_valid
+ .mode_valid = vmw_stdu_connector_mode_valid,
+ .atomic_check = vmw_stdu_connector_atomic_check,
};
--
2.34.1
